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Npdes Permit Fact Sheet Individual Sewage

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Npdes Permit Fact Sheet Individual Sewage Northcentral Regional Office CLEAN WATER PROGRAM a Application Type Renewal Application No. PA0038865 NPDES PERMIT FACT SHEET Facility Type Municipal INDIVIDUAL SEWAGE APS ID 1012712 Major / Minor Minor Authorization ID 1307797 a Applicant and Facility Information a Zerbe Township Wastewater Applicant Name Zerbe Township Municipal Authority Facility Name Treatment Plant Applicant Address 800 Mahanoy Street Facility Address 1350 Susquehanna Street Trevorton, PA 17881-1106 Trevorton, PA 17881 Applicant Contact Michael Schwartz Facility Contact Ed Reed Applicant Phone (570) 797-1974 Facility Phone (570) 797-1974 Client ID 78932 Site ID 255403 Ch 94 Load Status Not Overloaded Municipality Zerbe Township Connection Status No Limitations County Northumberland Date Application Received March 4, 2020 EPA Waived? No Date Application Accepted March 10, 2020 If No, Reason Significant CB Discharge Purpose of Application Renewal of an existing NPDES permit for the discharge of treated sewage. Public Participation DEP will publish notice of the receipt of the NPDES permit application and a tentative decision to issue the individual NPDES permit in the Pennsylvania Bulletin in accordance with 25 Pa. Code § 92a.82. Upon publication in the Pennsylvania Bulletin, DEP will accept written comments from interested persons for a 30-day period (which may be extended for one additional 15- day period at DEP’s discretion), which will be considered in making a final decision on the application. Any person may request or petition for a public hearing with respect to the application. A public hearing may be held if DEP determines that there is significant public interest in holding a hearing. If a hearing is held, notice of the hearing will be published in the Pennsylvania Bulletin at least 30 days prior to the hearing and in at least one newspaper of general circulation within the geographical area of the discharge. Approve Deny Signatures Date X Derek S. Garner 10/22/2020 Derek S. Garner / Project Manager X Nicholas W. Hartranft 10/22/2020 Nicholas W. Hartranft, P.E. / Environmental Engineer Manager NPDES Permit Fact Sheet NPDES Permit No. PA0038865 Zerbe Township Wastewater Treatment Plant Discharge, Receiving Waters and Water Supply Information Outfall No. 001 Design Flow (MGD) 0.5 Latitude 40º 47' 44.19" Longitude -76º 41' 19.09" Quad Name Trevorton Quad Code 1232 Wastewater Description: Sewage Effluent Receiving Waters Zerbe Run Stream Code 17639 NHD Com ID 54963747 RMI 6.55 2 Drainage Area 8.25 Yield (cfs/mi ) 0.061 Q7-10 Flow (cfs) 0.5 Q7-10 Basis Streamgage No. 1555500 Elevation (ft) 710 Slope (ft/ft) n/a Watershed No. 6-B Chapter 93 Class. CWF, MF Existing Use n/a Existing Use Qualifier n/a Exceptions to Use n/a Exceptions to Criteria n/a Assessment Status Impaired Cause(s) of Impairment Metals, pH Source(s) of Impairment Abandoned mine drainage TMDL Status Final Name Mahanoy Creek TMDL Nearest Downstream Public Water Supply Intake SUEZ Water PWS Waters Susquehanna River Flow at Intake (cfs) 2,610 PWS RMI 76.73 Distance from Outfall (mi) 50 Treatment Facility Summary a The Zerbe Township Wastewater Treatment Plant (“WWTP”), WQM Permit No. 4911401 issued 5/15/12, is a sequencing batch reactor (“SBR”) plant with a hydraulic design capacity of 0.5 MGD and an organic capacity of 751 lbs/day. Treatment at the facility consists of: • One (1) micro-screen w/ manual bar screen overflow • Two (2) 266,048-gal SBRs • One (1) open channel UV disinfection system • Two (2) sludge processing tanks (43,700-gal holding tank, 69,700-gal aerobic digester) o Sludge is either hauled to the Lycoming County Landfill or the Ralpho Township Municipal Authority Wastewater Treatment Plant (NPDES Permit No. PA0028738). Disinfected effluent is ultimately discharged via Outfall 001 to Zerbe Run. 2 NPDES Permit Fact Sheet NPDES Permit No. PA0038865 Zerbe Township Wastewater Treatment Plant Compliance History The facility was most recently administratively inspected by DEP on March 20, 2020. No operational issues were reported. One effluent violation, below, occurred during the existing permit’s term: Monitoring Monitoring Non- Period Period Compliance Sample Violation Permit Begin Date End Date Category Parameter Value Condition Value Unit SBC Conc. 3 Effluent Fecal 6/1/2017 6/30/2017 Violation Coliform > 2420 > 1000 No./100 ml IMAX Since there does not appear to be a chronic problem meeting the permit’s effluent limits, the above violation will not impact how effluent limits are developed during this renewal. There are no open violations associated with the permittee. Development of Effluent Limitations Outfall No. 001 Design Flow (MGD) 0.5 Latitude 40º 46' 54.71" Longitude -76º 41' 20.38" Wastewater Description: Sewage Effluent Technology-Based Limitations The following technology-based limitations apply, subject to water quality analysis and BPJ where applicable: Pollutant Limit (mg/l) SBC Federal Regulation State Regulation 25 Average Monthly 133.102(a)(4)(i) 92a.47(a)(1) CBOD5 40 Average Weekly 133.102(a)(4)(ii) 92a.47(a)(2) Total Suspended 30 Average Monthly 133.102(b)(1) 92a.47(a)(1) Solids 45 Average Weekly 133.102(b)(2) 92a.47(a)(2) pH 6.0 – 9.0 S.U. Min – Max 133.102(c) 95.2(1) Fecal Coliform (5/1 – 9/30) 200 / 100 ml Geo Mean - 92a.47(a)(4) Fecal Coliform (5/1 – 9/30) 1,000 / 100 ml IMAX - 92a.47(a)(4) Fecal Coliform (10/1 – 4/30) 2,000 / 100 ml Geo Mean - 92a.47(a)(5) Fecal Coliform (10/1 – 4/30) 10,000 / 100 ml IMAX - 92a.47(a)(5) Water Quality-Based Limitations Historically, water quality-based effluent limits were not applied to the discharge at Zerbe Run in accordance with 25 Pa. Code § 95.5(a)(1), which states that sewage discharges to waters impaired by abandoned mine drainage (“AMD”) so that water quality criteria are not being met and designated water uses are not being achieved to the extent that aquatic communities are essentially excluded must only treat to secondary technology standards. Instead, a point of first use was designated downstream at the confluence of Zerbe Run and Mahanoy Creek. A TMDL for the Mahanoy Creek watershed, which includes Zerbe Run, was finalized on March 13, 2007. The purpose of the TMDL is to address the watershed’s impairment caused by AMD. When a TMDL is in place, it can be reasonably assumed that water quality throughout the watershed will significantly improve. Under this assumption, in accordance with § 95.5(b)(1) and (2), DEP no longer believes the application of § 95.5(a)(1) is appropriate. Additionally, the TMDL states, p. 4, that sewage in the watershed is contributing to impairments but is generally being masked by the AMD. Accordingly, water quality-based effluent limits, if applicable, will be applied at Outfall 001 on Zerbe Run. 3 NPDES Permit Fact Sheet NPDES Permit No. PA0038865 Zerbe Township Wastewater Treatment Plant The applicability of WQBELs was evaluated using DEP’s WQM 7.0 v1.0b and the Toxics Management Spreadsheet (“TSM”). WQM 7.0 is a multiple source discharge model that is used to determine NPDES effluent limits for ammonia- nitrogen, CBOD5, and dissolved oxygen, if applicable. The TMS is a single discharge model that is used to determine NPDES effluent limits and monitoring requirements for toxics, if applicable. All model input/output data and supporting documentation is attached. Reaches were created in WQM 7.0 along Zerbe Run starting at Outfall 001 until a recovery in dissolved oxygen was observed. Discharge concentration input values of 25 mg/l were used for CBOD5 and ammonia-n, and a discharge concentration of 3 mg/l was assumed for dissolved oxygen. Effluent Limit (mg/l) Parameter Average Monthly Maximum Minimum CBOD5 12.94 - - Ammonia-nitrogen 3.56 7.12 - Dissolved Oxygen - - 5 Based on the above model output, WQBELs for CBOD5, ammonia-n, and dissolved oxygen are appropriate. Since these are newly proposed limits, DEP evaluated whether a compliance schedule would be necessary to avoid immediate noncompliance. A review of eDMR data indicates that during the existing permit’s term, there would have been zero CBOD5 or ammonia-n exceedances. Accordingly, a compliance schedule is not necessary. 4 NPDES Permit Fact Sheet NPDES Permit No. PA0038865 Zerbe Township Wastewater Treatment Plant For the TMS, input concentrations were taken from sample results included with the renewal application. The TMS output results are as follows: Mass Limits Concentration Limits AML MDL Governing WQBEL Pollutants AML MDL IMAX Units Comments (lbs/day) (lbs/day) WQBEL Basis Chloride (PWS) Report Report Report Report Report mg/L N/A N/A Discharge Conc > 10% WQBEL (no RP) (1) Sulfate (PWS) Report Report Report Report Report mg/L N/A N/A Discharge Conc > 10% WQBEL (no RP) (1) Total Copper 0.062 0.096 14.8 23.1 37.0 µg/L 14.8 AFC Discharge Conc ≥ 50% WQBEL (RP) Total Zinc Report Report Report Report Report µg/L 127 AFC Discharge Conc > 10% WQBEL (no RP) (1) There is no public water supply on Zerbe Run; therefore, PWS criterion is not applicable. TMDL Impairment The fact sheet developed for the most recent renewal, dated April 2015, summarizes two years’ worth of effluent sample results for aluminum, iron, and manganese to address the watershed’s impairment from AMD. The fact sheet concluded that since all sample results were below Chapter 93 criteria, there is no reasonable potential to exceed water quality criteria and further monitoring or limits are not necessary. Best Professional Judgment (BPJ) Limitations Raw sewage influent monitoring for BOD5 and TSS is proposed to remain in the permit to continue to help with Chapter 94 reporting.
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